2020-11-05, 15:01 #71 bsquared     "Ben" Feb 2007 336110 Posts Now processing 2^n+1 similarly to 2^n-1 (with special modulo) Here verifying some of the factors of 2^941+1 Code: ./avx-ecm "(2^941+1)/3/1738969" 8 3000000 starting process 60820 commencing parallel ecm on 3562975409753765647916625929286022733708067351160837396219090783379741715638222929662078302565476897014358133541083282322395686863751130956979946597434060607614269433132169774980382077527684835263114705184392392863404860166373197969977946080763606872357617994374214244244159779 ECM has been configured with DIGITBITS = 52, VECLEN = 8, GMP_LIMB_BITS = 64 Choosing MAXBITS = 1040, NWORDS = 20, NBLOCKS = 5 based on input size 941 cached 3001134 primes < 49999991 Input has 919 bits, using 1 threads (8 curves/thread) Processing in batches of 100000000 primes Using special Mersenne mod for factor of: 2^941+1 Initialization took 0.0899 seconds. Cached 5761455 primes in range [2 : 99999989] commencing curves 0-7 of 8 Building curves took 0.0001 seconds. commencing Stage 1 @ prime 2 accumulating prime 2943173 Stage 1 completed at prime 2999999 with 6040073 point-adds and 565931 point-doubles Stage 1 took 19.2999 seconds found factor 5062155107501579 in stage 1 in thread 0, vec position 0, with sigma = 424412553419277870 found factor 5062155107501579 in stage 1 in thread 0, vec position 5, with sigma = 8913334498632421225 commencing stage 2 at p=3000017, A=3000690 w = 1155, R = 480, L = 16, umax = 9240, amin = 1299 found 5317482 primes in range [99999989 : 199999963] commencing stage 2 at p=100000007, A=99965250 w = 1155, R = 480, L = 16, umax = 9240, amin = 43275 found 5173389 primes in range [199999963 : 299999957] commencing stage 2 at p=199999991, A=199979010 w = 1155, R = 480, L = 16, umax = 9240, amin = 86571 found 53 primes in range [299999957 : 300000997] commencing stage 2 at p=299999977, A=299974290 w = 1155, R = 480, L = 16, umax = 9240, amin = 129859 Stage 2 took 14.7954 seconds performed 9087802 pair-multiplies for 16035509 primes in stage 2 performed 266472 point-additions and 57 point-doubles in stage 2 found factor 5062155107501579 in stage 2 in thread 0, vec position 0, with sigma = 424412553419277870 found factor 5062155107501579 in stage 2 in thread 0, vec position 1, with sigma = 15371561253067696485 found factor 5062155107501579 in stage 2 in thread 0, vec position 2, with sigma = 13475164758719783696 found factor 1053336016261649316809 in stage 2 in thread 0, vec position 4, with sigma = 333700535869040322 found factor 5062155107501579 in stage 2 in thread 0, vec position 5, with sigma = 8913334498632421225 Process took 34.3731 seconds. Also, I'm only updating the avx-ecm repo with updates, for now. When things settle out a bit I'll revise yafu. Last fiddled with by bsquared on 2020-11-05 at 15:17